Warning of fresh threat from al-Qaeda in Iraq
22 December 2013 Last updated at 00:08 GMT
As the war in Syria escalates, the violent reverberations are being felt beyond its borders.
Al-Qaeda in Iraq - feeding off gains made by Sunni extremists in Syria - is waging an increasingly ferocious campaign of suicide attacks, car bombings and assassinations.
Dr Mowaffak al-Rubaie is Iraq's former National Security Advisor and the man who hanged Saddam Hussein.
He told the BBC's Quentin Sommerville that al-Qaeda in Iraq is back to full strength, and poses a threat to the region and the world.